Late Viriginia Springs?

That's what John Boyd says:

For many years on my Virginia farm I had my corn crop in the ground by the end of March. But that has not been the case for the last 10 years. Spring planting season has become more and more delayed because of changes in our weather patterns. Nowadays, I find myself planting corn in May.

He's in southern VA and I'm in northern, but I don't  think that's right, at least if I compare my vegetable garden to his field corn.  There's been a good deal of variability recently (and I can only remember "recently"), but I don't see climate change as delaying planting.